Mechanical or automatic pencils



1955 J. G. REY ET AL MECHANICAL OR AUTOMATIC PENCILS Filed Jan. 16, 1952ATTORNEYS United States Patent ()fiice 2,720,863 Eatented Oct. 18, 1955MECHANICAL OR AUTGMATIC PEN CILS Joaquin Garcia Rey and Rubens JesusGarcia, Buenos Aires, Argentina Application January 16, 1952, Serial No.266,722

2 Claims. (Cl. 120-48) The invention relates to improvements inmechanical pencils which are also known under the name of automaticpencils. The purpose of the innovation is that of otfering to the userof the pencil an improved implement during use.

At present in all known types of mechanical or automatic pencils bothhands are needed whenever it is wished to move the graphite rod or lead.A few of them are provided with a rotatory device which, when turned inone sense or another, produces the displacement of said graphite rod orlead. Others are provided at the opposed upper end with a press-buttonwhich also enables the advance of said rod or lead.

By means of the device which forms the subject-matter of this invention,the user will not need to interrupt his writing because, as soon as henotes that the point of the pencil is being worn down, it will besufficient to turn with the thumb of the hand which is holding thepencil a knurled ring, whereby the point of the pencil may be advancedin the required length.

So as to explain clearly the nature of the invention and the manner inwhich it can be carried into practice, an example thereof will bedescribed with reference to the accompanying drawings.

Figure 1 is a longitudinal, partly sectional view of increased sizewhich corresponds to an improved pencil.

Figure 2 is a side elevational view of one of the elements contained insaid improved pencil.

Figure 3 is a side elevational view of the improved pencil, but innatural size.

The new improved pencil consists of a cylindrical body 1 of any adequatematerial, such as metal or a plastic substance.

At one of the ends of said cylindrical body 1 an ample cylindricalcavity 2 will be provided. A cylindrical tubular element 4, force-fittedin a recess in the central part of bottom 3, terminates in cone 5 whichconstitutes the extremity of the pencil. Bore 6 of tubular element 4 isentirely cylindrical. Body 1, tubular element 4 and cone 5 form a rigidunity.

The body of tubular element 4 is of a smaller diameter than cavity 2 ofbody 1, whereby an annular space is provded therebetween into whichnipple 7 will be put. Said nipple 7 is provided with an innerscrew-thread 8. Upon part of the outer surface of nipple 7 a flange 9 isprovided. Said flange 9 has a slightly greater diameter than body 1. Thecircular surface 19 of flange 9 is knurled so as to produce a roughnesswhich will ofier a better grip to the thumb when rotation is intended.

Tubular element 4 has upon the body thereof a longitudinal perforation11. During mounting of the device two winged elements will be put intobore 6 of tubular element 4. One of them, viz. winged element 12, istubular and in the interior thereof a part of the graphite rod 13 willbe seated. Wing 14 which is solidary with element 12 passes throughperforation 11 and Will enter into screw thread 8 of nipple 7.

Another winged element 15 which conforms in Width to the perforation oftubular element 12 will be inserted therein. The winged end of element15 will pass through the lateral perforation or slot of tubular element12 and also through perforation 11 of tubular element 4 so as to enterfinally also into screw thread 8 of nipple 7.

Winged element 15 will form the expelling means of lead 13.

When nipple 7 is turned with the thumb of the hand which holds thepencil, by means of knurled ring 10 of flange 9, element 12 whichcarries graphite rod or supply mine 13 will be displaced.

If turning of nipple 7 is continued, winged element 15 will progressalong screw thread 8 and along the slot in tube 12 and will thereforepush graphite rod 13 expelling it definitively from the device. Whennipple 7 is turned in an opposite sense, a new graphite rod may beintroduced in the device.

We claim:

1. In a mechanical pencil, a cylindrical body having a central cavitytherein, an elongated fixed tubular guide casing having one end securedin said cavity and its other end enlarged and tapered and extendingoutwardly of the body, said guide casing having an elongated slot, atubular member slidably mounted in said fixed tubular guide casing, aninternally screw-threaded nipple member surrounding said fixed guidecasing and being seated in the cavity of said cylindrical body, saidslidable tubular member having an integral laterally screw-threadedextension extending through the slot in said guide casing and coactingwith the threads on said nipple for sliding said tubular member, a rodof lead carried by said slidable tubular member, and a screw-threadeddevice slidably mounted in said tubular member in line with said rod oflead and adapted to coact with the threads on said nipple for expellingsaid lead from the slidable tubular member, said fixed tubular casingconstituting a connection between its enlarged end and the cylindricalbody, a guide and a housing for said tubular member, rod and expellingdevice.

2. In a mechanical pencil, a cylindrical body having a central cavitytherein, an elongated fixed tubular guide casing having one end securedin said cavity and its other end enlarged and tapered and extendingoutwardly of the body, said enlarged end having a cavity, said tubularguide casing having an elongated slot, a tubular member slidably mountedin said fixed tubular casing, said tubular member having an elongatedslot therein, an internally screw-threaded nipple member surroundingsaid fixed guide casing and being seated in the cavity of saidcylindrical body and extending into the cavity in said enlarged end,said slidable tubular member having an integral laterally screw-threadedextension extending through the slot in said guide casing, and coactingWith the threads on said nipple for sliding said tubular member, a rodof lead carried by said slidable tubular member, and an elongated deviceslidable in said tubular member in line with the rod of lead, saiddevice having an integral laterally screw-threaded extension extendingthrough the slots in said guide casing and in said tubular member andadapted to coact with the threads on said nipple for expelling said leadfrom the slidable tubular member, said fixed tubular casing constitutinga connection between its enlarged end and the cylindrical body, a guideand a housing for said tubular member, rod and expelling device.

References Cited in the file of this patent UNITED STATES PATENTS1,489,765 Jones Apr. 8, 1924 1,574,393 Hofmann Feb. 23, 1926 2,110,551Friedlein et al. Mar. 8, 1938

